I looked into upgrading the low cluster and MID in 2004. I asked a similar question on another forum and got this reply:
I chose not to upgrade because of the pixel errors that people were having at that time.
Assuming you don't already have the high BC, this is what it would take to upgrade the 530:
wiring 61 12 0 306 722
cable ties 61 13 1 367 599 x20
coolant level switch 61 31 8 360 876
instrument cluster 62 10 6 942 197
The total parts cost for the above is about $600, and you will require an hour of labor at the dealer for coding. Vaheh at Crevier BMW was able to make the harness available for order in the U.S.
2001 530i/5 S+P CDV delete/Akebono ceramic pads
M5 SSK/RedLine MTL/M5 rear sway bar/Bilstein HD
BMWCCA Member #337964